There are no available studies of any kind that have looked at the Zone diet and its safety. Although all components of the diet have related literature that provides some insight into the potential risks and benefits of the diet, none have been studied well enough to provide firm recommendations.
Foods rich in vitamins and minerals, like calcium, iron, vitamins A, D, E and folic acid have limits set on them in the Zone diet. Foods rich in fiber, like whole grains and starches, are also limited. The Zone diet is considered a low carbohydrate diet plan. A qualified healthcare provider and nutritionist should be consulted before making decisions about diets.
Caution is advised in people with heart disease or high cholesterol due to the fat content of this diet. Caution is advised in athletes in training due to the restriction in calories recommended by the Zone.
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